... inverter1,V/F control mode (One inverter control more than one motor---- 3motors most) 2,Open-loop vector control mode 3,Simple ... Built-in PID can compose close-loop control system conveniently. It is suitable for process-control system, like pressure and flow ... Built-in PIDIt is convenient for forming closed loop control system, applicable for course control like pressure and flow, etc.Multi-speed ...